Work support for lens drilling machines



Ma 31, 1949. QTGRANT 2,471,871

WORK SUPPORT FOR LENS DRILLING MACHINES Filed Aug. '7, 1944 I N V ENTOR.

CHARL E6 T. 6mm

ATIORNE Patented May 31, 1949 WORK SUPPORT FOR LENS DRILLING MACHINESCharles '1. Grant, Southbridge, Mass, assignor to American ticalCompany,

Southbridge,

Mass, a volun ary association of Massachusetts Application August 7,1944, Serial No. 548,389

9 Claims.

This invention relates to drills and has particular reference to animproved support for use with drills adapted particularly for drillinglenses and the like.

One of the principal objects of the invention is to provide a device ofthe character described with novel means of sup-porting the Work to bedrilled and for regulating and controlling the drill position.

Another object is to provide a novel work support for a device of thecharacter described embodying means which may be quickly and easilyadjusted for determining the accurate drill position at which theperforation is to be formed in the work.

Another object is to provide a work support with adjustable portionswhich may be simply and quickly operated for determining the accurateposition at which the drill is to engage the work during the drilling ofa hole thereinand which will readily accommodate itself to work ofdifferent contour shapes.

Other objects and advantages of the invention will become apparent fromthe following description taken in connection with the accompanyingdrawings and it will be apparent that many changes may be made in thevarious details; of construction and arrangement of parts hereindescribed without departing from the spirit of the invention asexpressed in the accompanying claims. I, therefore, do not wish to belimited to the exact details of construction and arrangement of partsshown and described as the preferred forms only have been given by wayof illustration.

Referring to the drawings:

Fig. 1 is a front perspective view of the device embodying theinvention;

Fig. 2 is an enlarged perspective View of the work support andassociated adjustable portions thereon;

Fig. 3 is an enlarged sectional View taken as on line 33 of Fig. 1 andlooking in the direction indicated by the arrows;

Fig. 4 is a sectional view taken as on line 4-4 ofFig. 3 and looking inthe direction indicated.

by the arrows; and

Fig. 5 is an enlarged fragmentary view taken as on line 5--5 of Fig. 1and looking inthe direction of the arrows.

Referring more particularly to the drawings wherein like characters ofreference designate like parts throughout the several views, thedeviceembodying the invention comprises a boss 6 formed on the base 1 of aconventional type lens drill. Said lens drill comprises an upright 8which supports a bearing 9 having a lens drill of conventional typereciprocally supported therein. The said drill in is adapted to be movedin the bearing 9 by means of a hand lever H. The operative function ofthe said parts above described is similar to that of Patent No.1,370,035,, issued March 1, 1921, to Jeremiah Moffitt.

The present invention is directed particularly to the work or lenssupport which, as shown more clearly in Figs. 2 and 3, comprises a postl2 extending upwardly of the boss 6 and on which a sleeve i3 isrotatably supported. The sleeve 13 is provided with a cone point M onwhich the lens or work i5 is adapted to be rested during the drillingoperation. The sleeve i3 is provided with a collar It which is held inposition on said sleeve by screws and the like ii. The collar i6supports a blade spring or the like 88 which is adapted to engage alever l9 pivotally attached to the collar it by a pin or the like iii.The lever l9 has a stop block 2i secured adjacent the upper end thereofand which is adapted to be engaged by the edge 22 of the lens l5 to aidin accurately positioning the lens relative to the drill Ill. The leverl9 has a cam follower 23. pivotally attached thereto as illustrated atM. The said lever I9 is provided with an adjustment screw 25 adjacentthe end thereof opposed to the stop block 2|. The said adjustment screw25 is adapted to engage the side surface 26 of the cam follower 23 andfunctions to limit the outward movement of the cam follower relative tothe lever about the pivot 24. The cam follower 23 is provided with anend 21 adapted to engage a cam member 28 carried by a finger grip member29- which is rotatably supported on the sleeve it. The said finger grip.member 29 is provided with a circumferential inof saidcircumferentially grooved portions 30 and 3| respectively to retain theparts 2! and 13 in assembled relation with each other. The spring lockring 32 is held internally of the groove 30 by means of the cam member28 which is secured to said finger grip member 29 by screws or the like'33. The adjacent end 3 4 of the sleeve I3, as shown more clearly inFig. 4, is provided with a notched portion 35 adapted to receive aprojection '36 formed on the upper surface of the post 6. The notch .35is provided with end walls 37! and .38 which are adapted to engage theprojection 36 in different positions of adjustment of the sleeve post 2.

As shown in Fig. 2 the sleeve I3 is provided with an indicator line 39adapted to function cooperatively with a suitable scale 40 formed on theupper surface of the finger grip member 29. The indicator and scale 39and 40 are adapted to determine the required position of adjustment ofthe cam member 28.

Referring more particularly to Figs. 4 and 5 the sleeve I3 is shown asbeing provided with a pin 4| projecting outwardly thereof between thespaced ends 42 and 43 of the spring lock ring 32. This pin 4| is adaptedto hold the spring lock ring 32 against rotation internally of thecircumferential groove 3| of the sleeve l3 and the tension thereof issuch that when held in this manner it will cause a slight friction to beintroduced between said spring lock ring 32 and the inner wall of thecircumferential groove 3B of the finger grip member 29 when said fingergrip member is adjusted to alter the position of the cam member 28. Thisfriction tends to retain the finger grip member 2 9 and the cam member28 in adjusted position relative to the sleeve I3. The lens or work l5may be held in position on the cone point I4 during the drillingoperation by the hand of the operator or may be supported by a suitableclamping device such as shown in the above mentioned patent and carriedby a support 44 in the conventional manner.

The gist of the invention is to provide means for controlling theposition of the drilled hole relative to the edge 22 of the lens wherebythe said hole will be drilled at an accurate distance inwardly of saidedge 22. This distance is controlled by the position at which the stopblock ii is located relative to the center line of the drill In or point45 of the cone end M. This 4;

distance is varied controlled amounts by rotating the finger grip member29 to align the proper graduation of the scale 46 with the indicator 3t.Rotation of the finger grip member 25 causes the cam 28 attached theretoto be rotated about the sleeve l3. Rotation of the cam 28 which isengaged by the end 21 of the cam follower 23 will cause the stop block2| carried by the lever is to be moved inwardly or outwardly relative tothe point 45, depending upon the extent of adjustment of the cam member28, The blade spring I8. is adapted to retain the end 2! of the camfollower 23 in engagement with the periphery of the cam 28. Theadjustment screw 25, which is adapted to provide a stop end 21 againstwhich the pivotally supported cam follower 23 is adapted to engage, maybe adjusted to compensate for the wearing of the end 21 of the said camfollower or edge surface of the cam during the use of the device wherebythe position of movement of the stop block 2| may be made to correspondwith the position indicated by the indicator 39 and related graduationsof the scale 40. This is to insure that the block 2| will assume itsproper adjustment when the desired scale graduation is aligned with theindicator. The said adjustment screw 25 also provides means whereby theinitial accurate assembled positions of the parts may be obtained duringthe initial fabrication of the device.

It is particularly pointed out that the spring lock ring 32 is initiallyof a diameter greater than the diameter of the circumferential groove 36so that the said lock ring has to be sprung into nested relation withsaid groove. The in The notch 35 and projection 36 function to limit therotary movement of the sleeve |'3 on the herent tendency of the springlock ring to return to its initial groove 30 will cause the said ring tofrictionally engage the inner wall of the groove. This relation of thering and groove 30, therefore, introduces a friction binding actionbetween said lock ring and finger grip member 29 when said lock ring isheld against rotation by the pin 4|.

By rotary movement of the finger grip member 29, therefore, the accurateadjustment of the position of the stop block 2| relative to the conepoint 45 and longitudinal axis of the drill |0 may be quickly and easilyobtained.

When the lens I5 is to be drilled, the said lens is rested on the conepoint 45 with the adjacent edge thereof engaging the stop block and inthis manner the position of the drilled opening will be accuratelylocated inwardly of the edge 22 of the lens.

It is to be understood that the longitudinal axis of the drill I0 is inalignment with the longitudinal axis of the sleeve l3 with saidlongitudinal axis extending through the point 45 of the cone end. It iscommon practice to drill into the lens an amount substantially equal tohalf the thickness of the lens and to then turn the lens over, as shownby the dash lines 46, and complete the drilling. This is accomplished byforcing the drill downwardly by moving the lever downwardly in theconventional manner.

The entire unit embodying the sleeve I3, the lever is, the cam 28, etc.,is free to rotate on the post i2 so that the surface 2| of the blockengaging the edge of the lens is free to swing to the angle of theadjacent edge of the lens regardless of the shape of the contour of thelens. This movement takes place when the lens is placed on the cone endl4 and its edge is pressed into engagement with the surface of the blockedge 2|.

From the foregoing it will be seen that simple, eflicient and economicalmeans have been provided for accomplishing all of the objects andadvantages of the invention.

Having described my invention, I claim:

1. A work support for a device of the character described, said worksupport comprising a sleevelike member adapted to fit over an uprightformed on said device, said sleeve-like member having an end portion onwhich the work is to be rested, a lever pivotally connected with saidsleeve-like member having an engagement portion adjacent one end thereoflocated adjacent the work supporting end of the sleeve-like memher, amember rotatably mounted on said sleevelike member having a cam portionand means on said lever member for engaging said cam portion.

2. A work support for a device of the character described, said worksupport comprising a sleeve-like member adapted to fit over an uprightformed on said device, said sleeve-like member having an end portion onwhich the work is to be rested, a lever pivotally connected with 'saidsleeve-like member having an engagement portion adjacent one end thereoflocated adjacent the work supporting end of the sleeve-like member, amember rotatably mounted on said sleeve-like member having a cam memberthereon, means on said lever member for engaging said cam portion andresilient means for urging said engagement portion into engagement withthe cam member.

3. A work support for a drill having an upright post in substantialalignment with said drill, a

post and having a work supporting end, a lever pivotally supported bysaid sleeve-like member and having an engagement portion on the endthereof located adjacent the work supporting end of the sleeve-likemember, a cam member rotatably mounted on said sleeve-like member, meansassociated with said cam member and with the sleeve-like member forlocating the position of adjustment of said cam member and said leverhaving a contact portion adapted to engage the cam member.

4. A work support for a drill having an upright post in substantialalignment with said drill, a sleeve-like member rotatably mounted onsaid post and having a work supporting end, a lever pivotally supportedby said sleeve-like member and having an engagement portion on the endthereof located adjacent the work supporting end of the sleeve-likemember, a cam member rotatably mounted on said sleeve-like member, meansassociated with said cam member and with the sleeve-like member forlocating the position of adjustment of said cam member, said leverhaving a contact portion adapted to engage the cam member and resilientmeans for urging said contact portion into engagement with said cammember.

5. A work support for a drill having an upright post in substantialalignment with said drill, a sleeve-like member rotatably mounted onsaid post and having a work supporting end, a lever pivotally supportedby said sleeve-like member and having an engagement portion on the endthereof located adjacent the Work supporting end of the sleeve-likemember, a cam member ro-tatably mounted on said sleeve-like member,means associated with said cam member and with the sleeve-like memberfor locating the position of adjustment of said cam member, said leverhaving a contact portion adapted to em gage the cam member and resilientmeans for urging said contact portion into engagement with said member,said contact portion being adjustably supported by the lever.

6. A work support for a drill having an upright post, a sleeve-likemember rotatably mounted on said post and having a cone shaped worksupporting end, a lever pivotally connected with said sleeve-like memberand having an engagement portion on the end thereof adjacent the coneshaped end, means rotatably mounted on said sleeve-like member having acam member carried thereby and means on said lever for engaging said cammember.

7. A work support ,for a drill having an upright post, a sleeve-likemember rotatably mounted on said post and having a cone shaped worksupporting end, a lever pivotally connected with said sleeve-like memberand having an engagement portion on the end thereof adjacent the coneshaped end, means rotatably mounted on said sleeve-like member having acam member carried thereby, means on said lever for engaging said cammember and an adjustable contact portion carried by said lever forengaging the cam member.

8. In a lens drill a lens support mounted to rotate substantially aboutthe longitudinal axis of the drill, said support having a leverpivotally carried thereby, said lever having an engagement portionlocated adjacent the upper end of the support, and adjustable meansadjacent the lower end of the support for rocking the lever on its pivotcontrolled amounts for altering the position of the engagement portionrelative to said upper end of the support.

9. In a device of the character described, a support having a Workreceiving portion adjacent its upper end and having a movable barlikemember adjustably mounted thereon for movement in directionstransversely of the vertical axis of the support, said bar-like memberhaving a work engagement portion located adjacent the work receivingportion of said support, and cam means mounted on the support, said cammeans being rotatable about the vertical axis of the support as a centerand having its peripheral portion engaging an adjacent portion of themovable bar-like member, said peripheral portion of the cam means beingdefined by a plurality of difierent radii whereby the related positionof the Work engagement portion of the bar-like member to the workreceiving portion of the support may be varied by rotation of the cammeans.

CHARLES T. GRANT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 319,748 Rein June 9, 1885 380,130Minnich Mar. 27, 1888 603,025 Lord Apr. 26, 1898 1,222,559 Moffitt Apr.10, 1917 1,370,035 Mofiitt Mar. 1, 1921 1,801,222 Cayo Apr. 14, 19312,222,538 Maynard Nov. 19, 1940

